Okla. Admin. Code § 710:1-5-81
The following words and terms, when used in this Part, shall have the following meaning, unless the context clearly indicates otherwise:
"Commission" means the Oklahoma Tax Commission.
"Final liability" means:
(A) The tax, penalty and interest due after the expiration of the statutory prescribed time within which to file a protest to a proposed assessment;
(B) The amount due after the exhaustion of administrative remedies without appeal to the Supreme Court;
(C) A tax amount admitted to be due by a taxpayer's report;
(D) The amount found due after a final court decision concerning the existence or amount of the liability; or,
(E) Other cases of liabilities where further administrative or judicial review is not available and the only consideration is collectibility.
"Insolvency" means:
(A) The inability to pay debts as they fall due in the usual course of business; or,
(B) Having liabilities in excess of the reasonable market value of assets held.
"Person" means any individual, partnership, corporation, limited liability company, association, or public or private organization of any character.
"Settlement Agreement" means a written agreement between a taxpayer and the Commission whereby the Commission agrees to abate all or a portion of an outstanding tax liability, including the interest or penalties accruing thereto, and the taxpayer agrees to pay the remainder of such liability, if any, as provided herein.
"Tax Liability" means and includes the total amount of Oklahoma tax, penalty, or interest due.
"Taxpayer" means:
(A) Any person subject to or liable for any Oklahoma tax; or,
(B) Any person required to file a return, or to pay or withhold and remit any tax required by the provisions of any Oklahoma tax law that is administered by the Commission.
"Trust fund tax" means Oklahoma Sales Tax levied pursuant to 68 O.S. §§ 1350 et seq., Oklahoma Gross Receipts Tax (AKA Mixed Beverage Tax) pursuant to 37A §§ 5-105-5-107, Oklahoma Income Tax withholding levied pursuant to 68 O.S. §§ 2385.2-2385.28, or Oklahoma Motor Fuel taxes levied pursuant to 68 O.S. §§ 500.1 et seq.
Okla. Admin. Code § 710:1-5-81